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<h3 class="heading"><span class="type">Paragraph</span></h3>
<p>Introduce matrix notations:</p>
<div class="displaymath process-math" data-contains-math-knowls="">
\begin{equation*}
{\bf x}=\left(
\begin{array}{c}
x_1\\
x_2\\
\vdots\\
x_n
\end{array}
\right),\quad 
{\bf P}(t)=
\left(
\begin{array}{cccc}
p_{11}(t), &amp; p_{12}(t), &amp; \cdots, &amp; p_{1n}(t)\\
p_{21}(t), &amp; p_{22}(t), &amp; \cdots, &amp; p_{2n}(t)\\
\vdots &amp; \vdots &amp; \vdots &amp;\vdots\\
p_{n1}(t),  &amp; p_{n2}(t),  &amp; \cdots, &amp; p_{nn}(t)
\end{array}
\right),\quad
{\bf g}(t)=
\left(
\begin{array}{c}
g_1(t)\\
g_2(t)\\
\cdots\\
g_n(t)
\end{array}
\right).
\end{equation*}
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